Fluent: allow displaying feedback inside activity actions toolbar

[OEvgeny]

Changelog Entry

Added

• (Experimental) Added feedbackActionsPlacement style option to control feedback button placement, in PR #5407, by @OEvgeny
  • New style option supports two values: 'activity-actions' and 'activity-status' (default)
  • When set to 'activity-actions', feedback buttons are displayed in the activity actions toolbar
  • When set to 'activity-status', feedback buttons appear in the activity status area (default behavior)

Description

This PR introduces a new style option that allows placing feedback buttons inside the activity actions toolbar instead of the activity status area.

Specific Changes

• Added feedbackActionsPlacement style option in StyleOptions.ts
• Created new ActivityFeedback component to handle feedback rendering
• Moved feedback-related components to Activity folder
• Reworked activity status slots to use CSS
• Enhanced thumb button styling for activity actions placement
• Added new tests for feedback placement functionality
• Updated Fluent theme to use activity actions placement by default

---

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)